Blacksmith team "Man at Arms" does reproductions of famous weaponry in media. They'll closely examine footage to ensure accurate detailing, and the end product will a real weapon, not a plaything.
In this episode they're looking at Arya Stark's sword, Needle, and they've got a team of artisans who can craft a close replica, using traditional blacksmithing techniques. It makes me cringe to think of how many things that could go wrong in the process. The result is an elegant and deadly little blade fit for a small, homicidal noblewoman.